package com.haina.shop.interceptor;

import com.haina.shop.constant.JwtClaimsConstant;
import com.haina.shop.context.BaseContext;
import com.haina.shop.properties.JwtProperties;
import com.haina.shop.utils.JwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * jwt令牌校验的拦截器
 */
@Component
@Slf4j
public class JwtTokenUserInterceptor implements HandlerInterceptor {
    //注入令牌属性
    @Autowired
    private JwtProperties jwtProperties;
    //controller方法调用之前拦截
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)) {
            //当前拦截到的不是动态方法（静态资源），直接放行
            return true;
        }

        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getUserTokenName());
        if(token==null){
            //未携带token
            returnError(response);
            return false;
        }
        //2、校验令牌
        try {
            log.info("jwt校验:{}", token);
            Claims claims = JwtUtil.parseJWT(jwtProperties.getUserSecretKey(), token);
            //拦截之后获取当前用户id
            Long userId = Long.valueOf(claims.get(JwtClaimsConstant.user_ID).toString());
            //设置当前用户的id
            BaseContext.setCurrentId(userId);
            log.info("当前用户id：{}", userId);
            //3、校验没有异常，通过，放行
            return true;
        } catch (Exception ex) {
            //解析错误
            returnError(response);
            return false;
        }
    }
    public void returnError(HttpServletResponse response){
        response.setContentType("application/json");
        response.setCharacterEncoding("UTF-8");
        String jsonResponse = "{\"code\": \"A00004\", \"msg\": \"\", \"data\": null, \"version\": \"mall4j.v230424\", \"timestamp\": null, \"sign\": null, \"success\": \"fail\", \"fail\": true}";
        try (PrintWriter out = response.getWriter()) {
            out.print(jsonResponse);
            out.flush();
        } catch (IOException e) {
            // 处理异常
        }
    }
}
